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I live on Cape Cod and have hand fed Tamias Striatus for over a decade. I identify individuals and name them and know their lineage and personal habits, where they live, when they create new burrow entrances, etc. I have kept a fairly detailed log for most of this time. Males

Males in breeding season (and often well beyond that time) are easy to distinguish from females. Their scrotal sac is enlarged and obvious from behind and below. I’ve had munks who were in breeding condition most of the Summer, although that is not typical. Usually

Usually this condition only lasts perhaps a month or so. Females just prior to giving birth until some time after dispersal will have 3 or 4 rows of teats on their underside which are visible when they are sitting up. Of course when the female is pregnant she is usually pretty chubby.

I live on Cape Cod and have hand fed Tamias Striatus for over a decade. I identify individuals and name them and know their lineage and personal habits, where they live, when they create new burrow entrances, etc. I have kept a fairly detailed log for most of this time. Males in breeding season (and often well beyond that time) are easy to distinguish from females. Their scrotal sac is enlarged and obvious from behind and below. I’ve had munks who were in breeding condition most of the Summer, although that is not typical. Usually this condition only lasts perhaps a month or so. Females just prior to giving birth until some time after dispersal will have 3 or 4 rows of teats on their underside which are visible when they are sitting up. Of course when the female is pregnant she is usually pretty chubby.

I live on Cape Cod and have hand fed Tamias Striatus for over a decade. I identify individuals and name them and know their lineage and personal habits, where they live, when they create new burrow entrances, etc. I have kept a fairly detailed log for most of this time.

Males in breeding season (and often well beyond that time) are easy to distinguish from females. Their scrotal sac is enlarged and obvious from behind and below. I’ve had munks who were in breeding condition most of the Summer, although that is not typical.

Usually this condition only lasts perhaps a month or so. Females just prior to giving birth until some time after dispersal will have 3 or 4 rows of teats on their underside which are visible when they are sitting up. Of course when the female is pregnant she is usually pretty chubby.

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I live on Cape Cod and have hand fed Tamias Striatus for over a decade. I identify individuals and name them and know their lineage and personal habits, where they live, when they create new burrow entrances, etc. I have kept a fairly detailed log for most of this time. Males in breeding season (and often well beyond that time) are easy to distinguish from females. Their scrotal sac is enlarged and obvious from behind and below. I’ve had munks who were in breeding condition most of the Summer, although that is not typical. Usually this condition only lasts perhaps a month or so. Females just prior to giving birth until some time after dispersal will have 3 or 4 rows of teats on their underside which are visible when they are sitting up. Of course when the female is pregnant she is usually pretty chubby.